NoteHKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\<interface-name>
| Data type | Range | Default value |
|---|---|---|
| REG_MULTI_SZ | (Blank value | 0 | IP protocol numbers | 0 |
Specifies the protocols that are accepted by the raw IP transport on this interface when security filtering is enabled. This entry is used only when the value of EnableSecurityFilters is 1.
Protocols are identified by their protocol numbers. If the value of this entry contains valid protocol numbers, only IP datagrams using the specified protocols are accepted by the raw IP transport which provides raw sockets.
It determines which IP datagrams are accepted by the raw IP transport. It does not affect IP datagrams passed to other transports, such as TCP.
| Value | Meaning |
|---|---|
| (Blank value -- the entry appears in the registry, but there is no data in the value field.) | No datagrams are accepted. |
| 0 (or not in registry) | All datagrams are accepted. |
| Specific IP protocol numbers | Only datagrams with these IP protocol numbers are accepted. |
To change the value of this entry, use Network and Dial-up Connections. Right-click Local Area Connection, click Properties, click Internet Protocol (TCP/IP), and then click the Properties button. In the bottom, right corner of the Internet Protocol (TCP/IP) Properties page, click the Advanced button, click the Options tab, click TCP/IP filtering, click Properties and then, just above the IP Protocols box, click the Permit Only. This entry is associated with the values added to the IP Protocols list on this page.
Note
There is no defined or predictable response when the value of this entry includes both a zero and IP protocol numbers. Do not combine these values in this entry.
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